FLASK PROVIDED WITH A CLOSURE CAP WHICH CAN BE SEALED UNDER STERILE CONDITIONS IN SUCH A MANNER AS TO PROVIDE STERILITY OF THE CONTENT OF THE FLASK

BOUTEILLE MUNIE D'UN BOUCHON POUVANT ETRE SCELLE DE FACON STERILE POUR CONSERVER LA STERILITE DU CONTENU

English Abstract

ABSTRACT OF THE DISCLOSURE
A cap is provided for use in closing a con-
tainer such as a bottle or flask having a threaded neck which
includes a conical ring converging outwardly and a radial
shoulder at an inner end of the ring. The cap is threaded
internally for engagement on the threaded neck to move the
cap over the neck into an engagement position thereby closing
the container. The cap also defines a radial recess positioned
such that the recess lies adjacent to and inwardly of the
shoulder with the cap in the engagement position. Also, the
cap includes a tamper-proof ring engaged in the recess and
adapted to pass over the conical ring when the cap is moved
into the engagement position. At least part of the tamper-proof
ring is adapted to be trapped about the neck and against the
shoulder upon removing the cap to give a visual indication that
the cap has been dislodged from the engagement position. A
combination cap and bottle is also provided.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A cap for use in closing a container such as
a bottle or flask having a threaded neck, a conical ring
converging outwardly and a radial shoulder at an inner end of
the ring, the cap being threaded internally for engagement
on the threaded neck for moving the cap over the neck into
an engagement position to close the container and also defining
a radial recess positioned such that the recess lies adjacent
to and inwardly of said shoulder with the cap in the engagement
position, the cap further including a tamper-proof ring engaged
in the recess and adapted to pass over the conical ring when
the cap is moved into said engagement position, at least part
of the tamper-proof ring being adapted to be trapped about
the neck and against said shoulder upon removing the cap to
give a visual indication that the cap has been dislodged from
said engagement position.
2. A cap as claimed in claim 1 in which the inclin-
ation of the conical ring is in the range 10 - 25°.
3. A cap as claimed in claim 1 in which the inclin-
ation of the conical ring is 15°.
4. A cap as claimed in claims 1 or 2 in which the
outer end of the conical ring is rounded with a radius in
the range 0.3 - 0.5 mm.
5. A cap as claimed in claims 1 or 2 in which the
outer end of the conical ring is rounded with a radius of
0.4 mm.

6. A cap as claimed in claim 1 in which the tamper-
proof ring comprises concentric inner and outer portions and
frangible bridges between the inner and outer portions such
that the bridges break upon dislodging the cap and the inner
portion remains on the container to give said visual indication.
7. A cap as claimed in claims 1, 2 or 3 in which
the cap further includes a pipet aspirator.
8. A cap as claimed in claims 1, 2 or 3 in which
the cap further defines a bell.
9. A cap as claimed in claims 1, 2 or 3 wherein
the cap further includes a rubber stopper for sealing the
container.
10. A cap as claimed in claims 1, 2 or 3 wherein
the cap further includes a flat seal for engagement against
an outer end of the neck of the container.
11. A cap as claimed in claims 1, 2 or 3 in which
the cap further defines a conical seal engageable in the neck
of the container to seal the container.
12. The combination of a cap and a container where-
in the container includes a threaded neck, a conical ring
converging outwardly on the neck, and a radial shoulder at an
inner end of the ring, and wherein the cap is threaded internally
for engagement on the threaded neck of the container to move
the cap over the neck into an engagement position to close the
container, the cap defining a radial recess positioned such that
the recess lies adjacent to and inwardly of the shoulder with

the cap in the engagement position and the cap further includ-
ing a tamper-proof ring engaged in the recess and adapted to
pass over the conical ring when the cap is moved into said
engagement position, at least part of the tamper-proof ring
being adapted to be trapped about the neck and against said
shoulder upon removing the cap to give a visual indication
that the cap has been dislodged from said engagement position.
13. The combination claimed in claim 12 in which
the inclination of the conical ring is in the range 10 - 25°.
14. The combination as claimed in claim 12 in
which the tamper-proof ring comprises concentric inner and
outer portions and frangible bridges between the inner and
outer portions such that the bridges break upon dislodging
the cap and the inner portion remains on the container to
give said visual indication.

Description

1~17~7Z
This invention relates to a cap for use with a
container such as a bottle or flask to provide a sterlle
closure for the container.
Known threaded closures for containers such as
bottles and flasks are tamper-proof and prepared generally
from metal. Such closures can result in injury upon opening
the closure and in order to avoid such injuries special tools
have been provided. Caps of synthetic plastic material have
been used having the edges flanged by heating these edges.
However the temperatures necessary to create the flanging can
impair the sensitive contents of the container and can there-
fore be used to a limited degree only. Other tamper-proof
closures are also known but they are both large and cumbersome
to handle so that they cannot be used on smaller containers.
The present invention provides a cap for use in
closing a container such as a bottle or flask having a threaded
neck which includes a conical ring converging outwardly and
a radial shoulder at an inner end of the ring. The cap is
threaded internally for engagement on the threaded neck to
move the cap over the neck into an engagement position thereby
closing the container. The cap also defines a radial recess
positioned such that the recess lies adjacent to and inwardly
of the shoulder with the cap in the engagement position. Also,
the cap includes a tamper-proof ring engaged in the recess and
adapted to pass over the conical ring when the cap is moved
into the engagement position. At least part of the tamper-proof
ring is adapted to be trapped about the neck and against the
shoulder upon removing the cap to give a visual indication that
29 the cap has been dislodged from the engagement position.
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The invention will be better understood with
reference to the drawings, in which:
Fig. 1 is a side view partly in section, showing
a preferred embodiment of closure clap engaged about a pre-
ferred form of container neck;
Fig. 2 is a view similar to Fig. 1 showing the cappartially removed and including an alternative form of seal
or stopper;
Fig. 3 is a view similar to Fig. 1 showing another
embodiment of the closure cap;
Fig. 3a is a composite plan view of two embodiments
of tamper-proof ring;
Fig. 3b is a sectional side view on line IIIb of
Fig. 3a;
Fig. 3c is a sectional side view on line IIIc of
Fig. 3a; and
Fig. 4 is a further view similar to Fig. 1 and
showing yet another embodiment of the closure cap.
Reference is first made to Fig. 1 which shows a
container in the form of a bottle or flask 1 having a thread
2 on a neck 5. The thread is separated from a main part of
the flask by a conical ring 3 which converges outwardly and
ends at an inner end in a radial shoulder 4. A closure cap
6 has an internal thread 7 engaged on the thread 2 and, as
better seen in Fig. 2, defines a recess 8 for housing a tamper-
proof ring 9 in the closed or engagement position seen in
Fig. 1. The ring 9 is a friction fit iII recess 8 and is
engaged on the neck 5 during assembly by deflecting the ring
29 radially over the conical ring 3 of the neck 5. The ring 9

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is then engaged past the inner end 4 of conical ring 3 so
that upon removing cap 6 the ring 9 is left behind. This
ring then expands radially into the Fig. 2 position to pre-
vent reapplication of the cap on the flask and as a visual
indication that the flask has been opened or dislodged.
The ring 9 is also shown at the lower part of Fig. 3a
and in Fig. 3c where the ring is seen to be generally U-shaped
in cross-section.
Fig. 3a also shows a second embodiment of ring 9
in the upper part of this view. This embodiment includes
inner and outer portions 9a, 9b connected by frangible bridges
9c. These bridges fracture if the flask is opened leaving
portion 9a on the flask as a visual indication that the cap
has been dislodged.
Returning to the preferred embodiment shown in Fig. 1,
the cap includes a simple flat seal 11 on the inner inside
surface of an end wall 10 of the cap 6. However various other
seals could be used such as the combination stopper and seal
12 (sometimes known as a freeze-dry stopper) shown in Fig. 2
or the conical seal 13 forming an integral part of the cap
and shown in Fig. 3. A further embodiment is shown in Fig. 4
in which the cap is combined with a pipet aspirator 14 or
other structures such as a drop insert, or a bell end wall.
The form of end wall 10 can be varied to take round, angular,
grooved,b~idge or other shapes as preferred.
The containers described are preferably suited for
the storage of medicaments and reagents in li~uid and dry
form, for example in the form of powders or granules. The
29 container itself may be of glass, synthetic plastic material,

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or metal.
The conical ring 3 has an obliquity in the range
10 - 25 but is preferably 15. Also the inner part of the
conical ring where it meets the shoulder 4 should be rounded
because the tamper-proof ring of the closure cap should pass
over this portion readily. It has been found that a radius
in the range 0.2 - 0.5 mm. is acceptable with the preferred
radius being 0.4 mm.
The portion of the neck 5 inwardly of ring 3 should
have a diameter about 2 mm. smaller than the outer diameter
of the conical ring 3 and should be about 2 mm. longer than
the height of the tamper-proof ring 9 of the closure cap. This
will ensure proper application of the cap on the neck.
It will be evident from the foregoing that when the
cap shown in Fig. 1 is removed the ring 9 will be left behind
under the conical ring 4 and relax into its normal shape shown
in Fig. 2. Consequently if an attempt is made to reapply the
cap the ring will prevent full application of the cap and it
will be evident that the cap has been dislodged. If an attempt
is made to remove the ring 9 it will inevitably result in damage
to the bottle.
The tamper-proof ring shown in the upper part of Fig.
3a can include 2 to 10 bridges 9c. Preferably there are 8
bridges. After removal of the cap using this ring, the inner
portion 9a will be trapped under the conical ring 3 thereby
providing a visual indication that the cap has been dislodged.
The cap as shown in the drawings may be of synthetic
plastic materials, preferably polyethylene, polypropylene,
29 moulding resins, or of similar materials. Also, the tamper-

q2
proof ri.ng is preferably of synthetic plast.ics materialssuch as those listed for the cap.
In the case of the tamper-proof ring having the
bridges 9c shown in Fig. 3a, the ring is preferably glued
or welded to the cap so that the outer portion 9b remains
with the cap after the bridges have been broken.
Although the tamper-proof rings have generally U-
shaped cross-sections, the inner and outer circumferential
walls diverge at an angle in the range 2 - 10 to ensure
proper seating of the rings within the cap.